Method and means for dressing grindstones



Nov. 22, 1932. w. N. BAKER ET AL 1,888,614

METHOD AND MEANS FOR DRESSING GRINDSTONES Filed June 19, '1928 2 Sheets-Sheet 1 ATTORNEYJ Nov. 22,1932. w. N. BAKER ET AL 1,888,614

METHOD AND MEANS FOR DRESSING GRINDSTONES F'iled June 19, 1928 2 Sheets-Sheet 2 l VENT ATTORNEYS Patented Nov. 22, 1932 I 8 UNITED S A E PATENT, oFFicE,

. WEBSTER NOYES BAKER ANnRA'LPH A. MAsrnN, or emnvs rAtLsiiEw YORK, assmirv 03s T0 INTERNATIONAL-o PAPER qoMrA Y, A CORPORATION or NEW YORK mn'rrronmn MnAivs r012. DRESSING enmns'ronns Application filed June 19, 1828, Serial No. 286,515.

' -This invention relates to machines grinding woodto produce wood pulp for use more particularly in the manufacture of paper, machines for this purpose comprising usually a rotary grindstone against the periphery of which, 'wood held in a pocketlor pockets is forced" by suitable feeding means. In connectlon wlth' these mach1nes,'means are provided, usually in the form of a burr- U burring tool and its carrying post; being ing tool for dressing or sharpening the grinding surface of the stone when the lat- -terbecomes dull' or smooth by use, which tool is usually mounted for rotation in a suitable holder and is moved transversely .back 151 and forth across the face' of thestone while being forcibly pressed against the "same, as r the latter is rotated and while the wood is 5 beingground, and by such treatment the grinding face of'the stones; roughened or -sharpened,-all as wellkn'own in this art;

In the burring action,- a considerable amount of gritty, sandy and other material frame? equlpped with a wood holding pocket is removed from the stone-and is'carried 1 around by the same, along with the wood J pulp" entrained by the stone, and isjdischargedinto the usual pit beneath the stone 'into' which the'ground wood or pulp is re-' 1 ceived. This has been the cause of much annoyance and trouble, for ith'as been'neces =7 sary to remove the gritty and sandy fmate- A rial from the pulp by special processes, such for instancefasby the'process of sedimentation, for if it is left inthe pulp, the subsequent handling of the pulp'is interfered with, and defects are of "course developed in the paper produced therefrom.

It'is the aim of thepresent invention to" prevent this foreign material resulting from if) the burring action discharged in i and mixed with the pulp, and the. invention" Q consists of the improved method of and apparatus fordisposing of this gritty, sandy and-other,material by removing the same [{51 from the stone before it has, had a chance to, f reach the point where the'pulp is discharged.

I and collected, andin the specification to follow the-invention" will be described indetail; and" the novel featuresthereof will be r pointed out in the appended claims.

of the receptacle associated with the burring tool for receiving the sandy or gritty material resulting from theburring operatiomfthe shown ,in dotted lines.- a

F g.3 is a side elevation of the same; Fig. 4 is a fragmentary view in side elevation, on an enlarged scale, of the grinding" stone, theburring tool and associated recep 3 in which the wood to be' ground is forced against the grinding face of the stone by suit- 8 55 Fig. 2 is a plan view onan enlargedscale able feeding means wellknown in the art and not necessary here to illustrate, the ground wood'or pulp resulting from the grinding operation being discharged from the stonelinto a suitable receiving pit 4 beneath the stone.

To sharpen thegrinding' faeeof the stone when in continuedfuse it becomes dulled, a burring tool '51s provided which is rotatably mounted in a supporter burr post 6 carried by a slide 7 which latter is moved-backjand forth so as" to cause the tool, while-pressed, forcibly against the stone to traverse the grinding face of the-same during thegrinding operation Jon-the wood. 'In'this action of the tool a-considerable amountof sandy andgritty material is broken away fromthe stone and it becomes mixed with the pulp entrained by the-stone,zandin order to prevent this material from passing into and becoming mixed with the ground pulp inthe pit, we provide a receptacle; 8 to receive the said material,

which receptacle surrounds the lower portion of the burringtooland is firmly fastened to the sides of the, forked end of the burring post in which the, toolv is journaled, as by the holding; pocket pressed against the stone,

theburring tool is pressed against the grindi-ng face 'of the stone and is movedbackand r forth transversely, thereof. In this action Y i with'the receptacle 8moving along-with the-- burring tool,-and with its lip in closeprox-- the post. The form and relation of these partsv are such that the edge or lip 11 of the inner wall ofthe' receptacle will be sustained close to the peripheral grinding face of the'stone,

so that the sandy and gritty material resulting from the burringoperatiOn will, along with the pulp entrained by the stone, be delivered into, the receptacle and thus prevented from being carried down -bycthe stone and discharged into the receiving pit withthe pulp therein. 7 g The material end extended downwardly into the receptacle and terminating-near the bottom of the same. 5 By suitable suction means, not shown, ap-' plied to the outer end of the pipe, a'suction is created'thereinand the contents of the receptacle thus effectually removed.

In order to preventthe passage intothe pipe of co'arse particles such as would tend toclog the same, a screen '14; is" fixed in the f vessel near its bottom, and above-the open end of the pipe," the" screen being-of such mesh asv to permit the passage through it of particles of such finenessas will're'adily pass through the pipe without clogging the same.- I

bythearrow in Fig. 3, and with the wood in imity to the grinding i-face, t'he sandy and gritty and other material'resulting from the I I burrin'g operation,-to'gether with the wet pulp T-mixed therewith, will be 'defiecte'd from the Q face of thestone' and caused to, enter the re-- ceptacle' and will collect in the bottombf the Q-same, and due to the suction through the disf charge pipe the materialwill be continuously terial finding, its-way-into the mass of pulp discharged from the stone lintothe receiving j pit, and thefpulp will therefore-be kept free efi ectof which let Will be to dislodge any collecting in the receptacle, which will be mixed with water andwill form a pool" therein-,"is' removed therefrom, in the f "present instanceby-subjecting the surface of the collected ool of material 'to airpressure, 20 as by suction acting beneath said surface, by 1 means ofidischarge-pipe 12-which is extended "falong the burring' post and has its inner open I i removed therefrom- "Due tofthis action there. will no liability "of the sandy or grittyma-,

material or pulp adhering to the stone, and will deflect the same into the receptacle;

As shown in Figs. 2 and 3, a plate 17 is arranged above the open end of the receptacle at the upper side of the burring tool, and is fixed at its outer end to-the burr post and terminates at its'inner end closely adjacent the peripheral face of the tool, the purpose of which plate to prevent thepulpl entrained by the moving stone from entering th'e'receptacle, and also'prevent the material col- ;lecting .in the receptacle from being thrown out by the rotation of the burring tool- By thenprovision of the horizontal slots 10 in the side walls of the receptacle which reso ceivethefastening bolts, the rece-ptacle may be adjusted horizontally;relative to' the burring tool to and from the stone, and by this means the proper relation of'the lip 11 on the receptacle to the grinding face of the stone may be established,

In the foregoing description and accompanying-drawings, wehave set forth our invention, bothin respect to'the apparatus and method'i'nvolved, in'theparticular detailed 99 form and construction of theparts and the method of procedure, which we prefer to adopt, and which in practice have been found to answer to a satisfactory degree the ends I to be attained. Itiwill 'beunderstood, how--"-= ever, that thesedetails may be variously changed by the skilled mechanic without dc I parting from the-limits of'the invention; and y "furthermore it will be understoodthatthein vention is not'limited, either in respect-to th v v ;apparatus or method, exceptinsofar as such *;;In the operation of; the device, with the j Y grindstone rotating in the direction indicated limitations are specifiedin'the claims.

" Havingthus described our invention, what we'claimis: 1. In combination burring tool to dress the grinding face'of the stone, a receptacle associated with the burring pipe entering the receptacle and terminating at its end beneath said screen, and adapted to have suction applied to remove the gritty and other materialfrom thejreceptacle. V 3. In combination with a grindstone," a rotary burring tool to dress the grinding face of the stone, a receptacleassociatedwithsaid toolin a position to receive the gritty material resulting from the grinding operation, and a plate associated with thereceptacle and having its edge disposedadjacent the-peripherah with a grindstone, 4

1,ess,e 14

surface of the burring tool at its upwardly moving side to prevent the collected material from being thrown from the receptacle by the tool.

' 4. In combination with a grindstone, acrotary burring tool to dress the grinding face of the stone, a receptacle asociated with said tool in a position to receive the gritty material resulting from the grinding operation,

and a plate extending over the upper end of the receptacle and having its edge disposed adjacent the peripheral surface of the burring tool at its upwardly moving side to prevent entrance into the receptacle of pulp carried 15 over and onto said tool by the grindstone.

5. In the 'method of burring grindstones wherein the burring operation is effected by a burring tool held in contact with the moving face of the stone and traversed longitudinally thereof, the step of preventing the gritty and other material removed from the stone in the burring operation from mixing with the pulp, which consists in subjecting the surface of the stone, adjacent the point where the tool acts, and after said tool has acted, to a fluid V jet acting on the stone in a direction opposite that of the movement of the stone at that point, to dislodge the material removed by the burring tool, said jet being directed at such angle as to deflect the material dislodged from the stone, collecting the deflected material, and finally discharging the same.

6. In combination with a rotary grindstone, a rotary burring tool engaged therewith and movable longitudinally thereof to traverse the face of the stone, areceptacle associated with the tool to receive the material resulting from the burring operation, a water jet directed against the stone at a point adjacent thepoint of contact of the tool therewith, and in a direction opposite that of the movement of the stone at that point, to dislodge said material, said jet acting in a directionto cause the dislodged material to be deflected into said receptacle. e

In testimony whereof, we have aflixed our signatures hereto. 7 I

W. NOYES BAKER.

RALPH A. MASTEN'. 

